Astronomers had believed for some time that parallax would provide the first accurate measurement of interstellar distances — in fact, in the 1830s there was a fierce competition between astronomers to be the first to measure a stellar parallax accurately.

Astronomers of the era expected that changes over time in the apparent separation and relative location of these stars would provide evidence for both the proper motion of stars and, by means of parallax shifts in their separation, for the distance of stars from the Earth ( a method first suggested by Galileo Galilei ).

Astronomers have postulated that this fluctuating emission comes from the first known intermediate-mass black hole, of roughly 200 to 5000 solar masses.

Astronomers using the Hale Telescope have discovered distant objects at the edges of the known universe called quasars and have given us the first direct evidence of stars in distant galaxies.

Astronomers using the telescope discovered the first evidence for a supermassive black hole ( Sgr A *) at the centre of the Milky Way, and made the first optical observation of a gamma-ray burst.

* Astronomers claim first ' dark galaxy ' find

* Astronomers spot first ever dark galaxy ( The Register ), 2005

Astronomers first suspected that there was an invisible, dark, galaxy, upon observing galaxy NGC 4254.

When Pluto was first discovered, it was initially known as Planet X. Astronomers had been searching for another planet past Neptune, hoping to solve the dilemma of its rather irregular orbit.

And even among those Stars which are reckoned of the brightest Class, there appears a Variety of Magnitude ; for Sirius or Arcturus are each of them brighter than Aldebaran or the Bull's Eye, or even than the Star in Spica ; and yet all these Stars are reckoned among the Stars of the first Order: And there are some Stars of such an intermedial Order, that the Astronomers have differed in classing of them ; some putting the same Stars in one Class, others in another.

Astronomers think the collision between Earth and Theia happened at approximately 4. 53 Gya ; about 30-50 million years after the Solar System began to form.

In an interview with Christianity Today, Jastrow said " Astronomers now find they have painted themselves into a corner because they have proven, by their own methods, that the world began abruptly in an act of creation to which you can trace the seeds of every star, every planet, every living thing in this cosmos and on the earth.

Astronomers estimate that the Milky Way experiences roughly 30 to 60 novae per year, with a likely rate of about 40.

* 2002 — Astronomers at the Max Planck Institute for Extraterrestrial Physics present evidence for the hypothesis that Sagittarius A * is a supermassive black hole at the center of the Milky Way galaxy

Astronomers have long believed that the Magellanic Clouds have orbited the Milky Way at approximately their current distances, but evidence suggests that it is rare for them to come as close to the Milky Way as they are now.

Astronomers are confident that these observations of Sagittarius A * provide good empirical evidence that our own Milky Way galaxy has a supermassive black hole at its center, 26, 000 light-years from the Solar System because:

Astronomers continue to investigate the astrophysics of a large scale feature of the Milky Way to which he called their attention in 1877, and honor him with its name, The Gould Belt.

Astronomers believe that the Canis Major Dwarf Galaxy is in the process of being pulled apart by the gravitational field of the more massive Milky Way galaxy.

Astronomers have identified ethyl formate in dust clouds in an area of the Milky Way galaxy called Sagittarius B2.

Astronomers have determined that it is between 6, 000 and 8, 000 years old ; it is approximately one light-year in diameter.

Astronomers speculate that this phenomenon is caused by the shock wave from a supernova.

Astronomers know today that the Earth revolving around the sun is tilted on its axis, bringing each hemisphere now closer to the sun, now further away.

From 1988 he is an honourable member of the Society of Mathematicians, Physicists and Astronomers of Slovenia ( DMFA ).

Astronomers think that the sun had about 70 – 75 % of the present luminosity, yet temperatures appear to have been near modern levels even within 500 Ma of Earth's formation, which is puzzling ( the faint young sun paradox ).

The Jalali calendar was introduced by Omar Khayyám alongside other Mathematicians and Astronomers in Nishapur, today it is one of the oldest calendars in the world as well as the most accurate solar calendar in use today.

Astronomers categorize it as a main-sequence star of spectral class K2, which means that energy generated at the core through nuclear fusion of hydrogen is emitted from the surface at a temperature of about 5, 000 K, giving the star an orange hue.

Astronomers have speculated that either intense star formation regions or active galactic nuclei ( which contain supermassive black holes ) may be responsible for the intense dust heating that produces this emission, although the general consensus is that both may be present in most ULIRGs.

Astronomers have paid particular attention to whether earthshine measurement can detect the red edge, a spectral feature that is due to the plants.

Astronomers surmise that the disk is the remnants of a smaller galaxy that merged with NGC 7052.

Astronomers were able to discover that IRS2 is in fact a twin system composed of two almost equally massive stars.

The International Fellowship of Rotarian Amateur Astronomers ( IFRAA ) is a fellowship group of amateur astronomers which spans the continents.

Astronomers anticipate an increase of activity in the region of the black hole, giving opportunity for further study, in mid-2013, as it is expected that a large gas cloud will be disrupted by close approach.

St Margaret's Church ( built 1839 – 41, architect: John Brown ) is the burial place of three Astronomers Royal: Edmond Halley, Nathaniel Bliss and John Pond.

Astronomers Robert Grant and William Swan ( of the United Kingdom ) and Karl Ludwig von Littrow ( of Austria ) observe this eclipse and determine that solar prominences are part of the Sun because the Moon is seen to cover and uncover them as it moves in front.

Astronomers speculate that NGC 300 X-1 is a new kind of Wolf-Rayet black hole binary system similar to the confirmed such system IC 10 X-1.

The Association of Bangalore Amateur Astronomers ( ABAA ) is an independent association housed in the Jawaharlal Nehru Planetarium, Bangalore.

Farpoint Observatory is an astronomical observatory owned and operated by Northeast Kansas Amateur Astronomers ' League, or NEKAAL.

Norman Sperling is a recipient of the National Service Award by the Western Amateur Astronomers, and had been recognized " For special and meritorious service for his unusual dedication and service to the astronomical community in all areas of astronomy " by the Astronomical Association of Northern California.

Astronomers were surprised at this as the Moon is the only large object in orbit around the Earth and anything else would have been ejected long ago due to perturbations with the Earth, the Moon and the Sun.

Astronomers theorize that a collision with a smaller companion galaxy near the core of the main galaxy could have led to the unusual spiral structure.

Astronomers posit that its dust lanes, not common in elliptical galaxies, are due to a previous merger with another galaxy, probably a spiral galaxy.

Astronomers initially thought that the halo was small and light, indicative of a spiral galaxy.